My girlfriend caught a cold. I caught it when I kissed her.

Kissing is not enough to cause cold infection, because the cold virus is mainly concentrated in the nasal cavity. According to the research of American scientists, the concentration of cold virus contained in saliva is very low, which is generally not enough to spread colds. The most dangerous contact with a cold patient is shaking hands. Because the patient's hands often touch his nose, there are a lot of viruses and bacteria. In addition, there are also a large number of cold viruses on public facilities such as doorknobs and telephones that patients have contacted. Moreover, viruses can survive on these hard surfaces for dozens of hours. Therefore, forming the habit of washing hands frequently is an effective way to reduce the spread of colds.

Hehe, tell her next time not to let you kiss!